Occultation event with (12238) Actor, event index number 3701
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/30 16:24:33 UTC
J2000 position of star is 11:48:51.3 -15:43:48
Equinox of date position of star is 11:50:11.8 -15:52:35
Star is 27 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.8 per integration for unocculted signal
Expected flux drop is 66% with SNR of 2.5 for the occulted depth (per occulted point)
Apparent velocity is 14.8 km/sec on the sky relative to the star, or, 15.1 arcsec/hr.
Position angle of asteroid motion is 145.6 degrees
The recommended exposure time corresponds to 7.4 km per image.
The 1-sigma error in the time of the event is 2.5 seconds.
The 1-sigma cross-track error in the shadow position is 17.3 km.
The sky-plane scale is 3506.1 km/arcsec.
Diameter estimates:
39.3 km assuming a 5% albedo, maximum of 2.7 sec for a central chord
16.0 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 30.3 km used for deployment plan.
Star training set for 12238_Actor, (2026/04/30 16:25UT) Object RA Dec mag sep mel Spica 13:26:35.0 -11:17:52 1.0 23.85 5 4Gam Crv 12:17:09.8 -17:41:17 2.6 6.70 21 30Eta Crt 11:57:21.7 -17:17:51 5.2 2.23 25 PPM 224921 11:49:13.7 -15:36:30 8.1 0.36 27 PPM 224931 11:49:36.7 -15:48:32 9.5 0.16 27 12238_Actor 11:50:11.8 -15:52:35 16.4 27 Positions are for equinox of date
Star training set for 12238_Actor, (2026/04/30 16:25UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 23.85 5 4Gam Crv 12:15:48.1 -17:32:30 2.6 6.70 21 30Eta Crt 11:56:00.9 -17:09:03 5.2 2.23 25 PPM 224921 11:47:53.2 -15:27:43 8.1 0.36 27 PPM 224931 11:48:16.2 -15:39:45 9.5 0.16 27 12238_Actor 11:48:51.3 -15:43:48 16.4 27 Positions are for J2000